first installation ZCS 5.0GA on centos 4.6 failed

hi all,

i was installed zimbra on my server centos 4.6.

failed(2) when initialized LDAP

error

Code:

[zimbra@domain root]$ /opt/zimbra/libexec/zmldapinit
is only avaliable with the XS version at /opt/zimbra/zimbramon/lib/IO/Socket/SSL.pm line 30
BEGIN failed--compilation aborted at /opt/zimbra/zimbramon/lib/IO/Socket/SSL.pm line 30.
Compilation failed in require at /opt/zimbra/zimbramon/lib/Net/LDAP.pm line 970.

i was instal Scalar:Util from CPAN. and try install ZCS but it doesnt work.